Electric car-brake



M e h -.S m e e h s 3 D 0 O W T C E T T 0 M A L m d 0 M o m ELEUTRIG CAR BRAKE.

No. 466,212. Patented Dec. 29, 1891.

Imelda): W 6. 222M MW/e -W 3 Shets-Sheet 2v (No Model.) LA MOTTE O. ATWOOD.

ELECTRIC OAR BRAKE;

Patented Dec. 29, 1891.

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3 sheets-sheet 3.

(No Model.)

ELECTRIC GAB. BRAKE. No. 466,212. Patented Dec. 29, 1891.

.BnrerZar: @w w UNITED STATES PATENT OFFICE.

LA MOTTE C. ATVVOOD, OF ST. LOUIS, MISSOURI, ASSIGNOR TO THE ATWOOD ELECTRIC COMPANY, OF EAST ST. LOUIS, ILLINOIS.

ELECTRIC CAR-BRAKE.

SPECIFICATION forming part of Letters Patent No. 466,212, dated December 29, 1891. Application filed January 10, 1891- Seiial No. 377,339. (No model.)

To all whom, it may concern:

Be it known that 1, LA MOTTE O. ATWOOD, of the city of St. Louis, in the State of Missouri, have invented a certain new and useful Improvement in Electric Car-Brakes, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification.

My invention relates to an improved electric brake for railway-cars; and my invention consists in features of novelty hereinafter fully described, and pointed out in the claims.

Figure I is a top or plan view illustrative of my invention and showing the parts in the position they occupy when the brakes are not applied. Fig. II is an elevation, part in section,showing the brakes in the same position as illustrated in Fig. I. Fig; III is a top or plan View showing the parts in the position they occupy when the brake-shoes are applied to the wheels, but before the track-brake has been applied; and Fig. IV is an elevation, part in section, showing the parts in the same position as illustrated in Fig. III. Fig. V is a top or plan View showing the parts in the position they occupy when both the brake-shoes and track-brakes are applied; and Fig. VI is in elevation, part in section, showing the parts in the same position as illustrated in Fig. V.

Referring to the drawings, 1 represents two of the wheels of a car-truck, and 2 part of one of the track-rails.

3 represents the brake-shoes, and 4 the trackbrake. The shoes 3 are connected by links 5 to an arm 6, rigidly secured to a rock-shaft 7, suitably journaled to the bottom of the car.

8 represents a lever rigidly secured to the shaft 7 at its lower end and connected'at its upper end by means of a coil-spring 9 and a chain 10 to the stem 11 of a rack-segment 12. The lower end of the stem 11 is pivoted at 13 to a fixture 14. The teeth of the segment 12 are engaged bya pinion 15 on the shaftof an electric motor 16.

17 represents a wire leading from the electric supply through a suitable switch 18 to the motor, and 19 represents the wire leading from the motor.

The track-brake 4 is secured to the lower arm of a bell-crank lever 20, supported on a suitable shaft or pivot 21. The upper end of the lever 20 is connected by a chain 22 to the stem 11 of the rack 12. 23 represents the side rail of the truck.

The operation is as follows: When the current is applied, the armature of the motor turns in the direction of the arrow,Fig. I, and the rack 12 with its arm is moved from the position shown in Fig.1 to the position shown in Fig. III, which applies the brake-shoes to the wheels, as shown in Figs. III and IV. The spring 9 is of sufficient tension as not to be materially lengthened out or affected by the application of the brake-shoes, and the chain 22 of the track-brake lever is longer than the combined length of the chain 10 and spring 9 of the brake-shoe lever, so that when the brake-shoes are applied the slack of the chain 22 is simply taken up without applying the track-brake. If the application of the brake-shoes is not sufficient to stop the car, an additional amount of current is applied, and the motor moves the rack 12 with its stem 11 from the position shown in Fig. III to the position shown in Fig. V. This additional force lengthens out the spring 9 of the brakeshoe lever and forces the track-brake down onto the rail 2, the spring thus permitting the track-brake to be applied without danger of wreckage to any of the parts of the brakeshoe mechanism. In this manner I make a very effective, a very cheap, and a very simply-constructed combined shoe and trackbrake.

If it is desired to apply the brakes to a trailcar, it is only necessary to connect the brakes of such trail-car to the levers 8 and 20, (the brake-shoe mechanism of such trail-car being connected to the lever 8 and the track-brake mechanism to the lever 20 by suitable chains 10 and 22%) as indicated in Fig. 1; or if the trailing-car is at the other end of the car provided with the motor, which I have shown, then the brake-shoes of the trailing-car would be applied through means of a lever 30, pivoted at 31 to the fixture 14: through means of a chain or chains 32, and the lever would be connected to the chain 10 or to the chains 10 and 22.

I claim as my invention- 1. In an electric car-brake, the combination of the brake-shoes, the track-brake, an electric motor, a pivoted stein, a suitable connection between one of the brakes and the stem, a relatively longer connection between the other brake and said stem, and a train-of-gear connection between said motor and said stem, whereby the stem may be moved a greater or less degree and the respective brakes applied successively.

2. In an electric car-brake, the combination of the brake-shoes, a rack-segment having a pivoted stem, a connection between the brakeshoes and stem, and a motor having a pinion on its armature engaging said rack-segment, substantially as and for the purpose set forth.

3. In an electric brake, the combination of the brake-shoes, a rock-shaft, an arm secured to the rock-shaft, links connecting the brakeshoes to the arm, a lever secured to the shaft, a rack-segment having a pivoted stem, a connection between said lever and stem, a motor, and a pinion on the armature of the motor engaging said rack-segment, substantially as and for the purpose set forth.

4. In an electric brake for cars, the combination of the shoes, at rock-shaft, an arm secured to the rockshaft, the links connecting the shoes to the arm, a lever secured to the rockshaft, a rack-segment having a pivoted stem, a chain-and-spring connection between said lever and stem, an electric motor having a pinion engaging said rack-segment, a trackbrake, and a lever-and-chain connection between said track-brake and the stem of the rack-segment, substantially as and for the purpose set forth.

5. In an electric brake, the combination of a motor provided with a pinion, a rack-segment having a pivoted stem with which said pinion engages, brake-shoes having a yielding connection with said rack-stem, and a track-brake having a connection with said stem, whereby when the rack is moved to apply the brake-shoes the track-brake is not applied and whereby a further movement of the rack permits the track-brake to be applied, substantially as set forth.

LA MOTTE O. ATWOOI).

In presence of- E. S. KNIGHT, lHos. KNIGHT. 

